"PAST RESULTS OF S&P WINNING EDGE DAY TRADING METHODOLOGY IS NOT INDICATIVE OF FUTURE PERFORMANCE. THE MONTHLY AND COMPOSITE ANNUAL RESULTS SHOULD BE VIEWED AS HYPOTHETICAL. IN REALITY, THE RESULTS DO NOT REPRESENT THE TRACK RECORD OF THE METHODOLOGY ORIGINATOR OR STUDENTS. THIS ALSO MEANS THERE IS NO GUARANTEE THAT ONE APPLYING THIS METHODOLOGY WOULD HAVE THE SAME RESULTS AS POSTED. SINCE TRADING FUTURES SUCCESSFULLY DEPENDS ON MANY ELEMENTS INCLUDING BUT NOT LIMITED TO A TRADING METHODOLOGY AND TRADERâS OWN PSYCHOLOGY, THIS MANUAL DOES NOT MAKE ANY REPRESENTATION WHATSOEVER THAT THE ABOVE MENTIONED TRADING SYSTEM MIGHT BE OR IS SUITABLE OR PROFITABLE FOR YOU."

Sort of says it all with respect to the past performance numbers. The literature also says it is not a mechanical system, which means there is probably some subjectivity to the signals. Using hindsight, the signals are usually too obvious, but when the chips are down, the tougher it is to pull the trigger or get out too soon.